Sen. Robert Menendez (D-N.J.) proposed to his girlfriend in the rotunda of the U.S. Capitol, Politico's Mike Allen reported Tuesday.

The lawmaker, who chairs the Senate Foreign Relations committee, told his colleagues of his engagement to Alicia Mucci during the White House congressional ball.

His office confirmed the news to USA Today.

Sen. John McCain (R-Ariz.) tweeted words of congratulations to the couple:

Menendez also took to Twitter to thank family and friends:

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  • Ken Cuccinelli

    Virginia Republican gubernatorial candidate, Virginia Attorney General Ken Cuccinelli, votes at Brentsville District High School in Nokesville, Va., Tuesday, Nov. 5, 2013. Cuccinelli faces Democrat Terry McAuliffe in today's election.(AP Photo/Cliff Owen)

  • Terry McAuliffe, Peter McAuliffe

    Virginia Democratic gubernatorial candidate Terry McAuliffe, right, turns toward his son Peter after completing his vote on election day in McLean, Va. on Tuesday, Nov. 5, 2013. (AP Photo/Jacquelyn Martin)

  • Ken Cuccinelli

    Virginia Republican gubernatorial candidate, Virginia Attorney General Ken Cuccinelli, greets a voter outside of a polling station at Brentsville District High School in Nokesville, Va., Tuesday, Nov. 5, 2013. Cuccinelli faces Democrat Terry McAuliffe in today's election.(AP Photo/Cliff Owen)

  • Terry McAuliffe

    Virginia Democratic gubernatorial candidate Terry McAuliffe, left, shakes hands with a poll worker as he arrives to vote on election day, Tuesday, Nov. 5, 2013 in McLean, Va. (AP Photo/Jacquelyn Martin)

  • Ken Cuccinelli, Teiro Cuccinelli

    Virginia Republican gubernatorial candidate, Virginia Attorney General Ken Cuccinelli and his wife Teiro leave the polling station after casting their votes at Brentsville District High School in Nokesville, Va., Tuesday, Nov. 5, 2013. Cuccinelli faces Democrat Terry McAuliffe in today's election. (AP Photo/Cliff Owen)

  • Terry McAuliffe, Dorothy McAuliffe

    Virginia Democratic gubernatorial candidate Terry McAuliffe, right, and his wife, Dorothy McAuliffe, walk past a sign for his Republican opponent, Ken Cuccinelli, after voting on election day Tuesday, Nov. 5, 2013, in McLean, Va. (AP Photo/Jacquelyn Martin)

  • Bill de Blasio

    New York City Democratic mayoral candidate Bill de Blasio votes at the Park Slope Branch Public Library in the Brooklyn borough of New York November 5, 2013. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Joe Lhota

    Republican mayoral candidate Joe Lhota, center, waits before voting in the general election on Tuesday, Nov. 5, 2013, in the Brooklyn borough of New York. His rival, Democrat Bill de Blasio, has been up nearly 40 percentage points in every survey conducted since the general election matchup was set nearly two months ago. (AP Photo/Bebeto Matthews)

  • Bill de Blasio

    New York City Democratic mayoral candidate Bill de Blasio (2nd L) with his wife Chirlane McCray (2nd R), daughter Chiara (L) and son Dante (R) after voting at the Park Slope Branch Public Library in the Brooklyn borough of New York November 5, 2013. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Joe Lhota

    Republican candidate for New York City mayor Joe Lhota studies his ballot before casting his vote on November 5, 2013 in the Brooklyn borough of New York City. (Photo by John Moore/Getty Images)

  • Barbara Buono

    New Jersey Democratic gubernatorial candidate Barbara Buono exits a voting booth after casting her vote, Tuesday, Nov. 5, 2013, in Metuchen, N.J. Buono is challenging Republican Gov. Chris Christie, who is running for re-election. (AP Photo/Julio Cortez)

  • Virginia Polls

    Election officer Richard Meyer directs people so they can vote in an election that includes the Virginia gubernatorial race between Republican Ken Cuccinelli and Democrat Terry McAuliffe on election day in McLean, Va., Tuesday, Nov. 5, 2013. (AP Photo/Jacquelyn Martin)

  • Virginia Polls

    Poll worker Daniel Andrews shows Jessica Roberts how to use an electronic voting machine at Patrick Henry High School in Roanoke, Va., on Tuesday, Nov. 5, 2013. (AP Photo/The Roanoke Times, Joel Hawksley)